Plant tropisms: The ins and outs of auxin
نویسنده
چکیده
The Cholodny-Went hypothesis holds that gravitropic curvature of a growing plant organ depends on regulated transport of the plant hormone auxin; new studies of the agravitropic mutant aux1 of Arabidopsis provide strong evidence in support of this hypothesis.
منابع مشابه
Plant hormones: Ins and outs of auxin transport
Regulated transport has long been known to play a key part in action of the plant hormone auxin. Now, at last, a family of auxin efflux carriers has been identified, and the characterisation of one family member has provided strong evidence in support of models that have been proposed to explain gravitropic curvature in roots.
متن کاملGrowth, Auxin, and Tropisms in Decapitated Avena Coleoptiles.
With all the work on auxin appearing in the last years it is remarkable that not more investigations are concerned with the actual role of the auxins inside the plant. Barring some early opposition, the original statement "Without auxin no growth" (12) has stood unchallenged for many years. Probably this was so because all test methods were based on the principle of proportionality between auxi...
متن کاملModeling halotropism: a key role for root tip architecture and reflux loop remodeling in redistributing auxin
A key characteristic of plant development is its plasticity in response to various and dynamically changing environmental conditions. Tropisms contribute to this flexibility by allowing plant organs to grow from or towards environmental cues. Halotropism is a recently described tropism in which plant roots bend away from salt. During halotropism, as in most other tropisms, directional growth is...
متن کاملInteraction of PIN and PGP transport mechanisms in auxin distribution-dependent development.
The signalling molecule auxin controls plant morphogenesis via its activity gradients, which are produced by intercellular auxin transport. Cellular auxin efflux is the rate-limiting step in this process and depends on PIN and phosphoglycoprotein (PGP) auxin transporters. Mutual roles for these proteins in auxin transport are unclear, as is the significance of their interactions for plant devel...
متن کاملThe polarly localized D6 PROTEIN KINASE is required for efficient auxin transport in Arabidopsis thaliana.
The phytohormone auxin is a major determinant of plant growth and differentiation. Directional auxin transport and auxin responses are required for proper embryogenesis, organ formation, vascular development, and tropisms. Members of several protein families, including the PIN auxin efflux facilitators, have been implicated in auxin transport; however, the regulation of auxin transport by signa...
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ورودعنوان ژورنال:
- Current Biology
دوره 6 شماره
صفحات -
تاریخ انتشار 1996